An exhibit at the Museum of Contemporary Art about green technology featured several unusual bikes. The TWIKE is a well-known enclosed bike car from Germany. It looks kind of dorky on the inside, doesn't it?

Many of the bike rickshaws used in India are heavy and ancient machines, but the Indian Cycle Rickshaw Modernization Project is producing lighter, improved models.

Note the under-the-rim brakes and suspension connected to the handlebars.

In parts of Africa where transportation to hospitals is difficult, this simple trailer bed can haul patients easily. But if you were laying in pain, would you want to ride on this over rugged roads?

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